Usually American soldiers and military personnel are exempt from local policing. In Germany, they couldn't be stopped for a traffic control or asked to identify themselves by German police, only US military police. There even was a guy that got away with murder because of some related issues.
Here's the story:
It was inspiring. Many people watched and listened to him speaking the truth. This is also a blueprint for protesting in the nation: Shut stuff down. Shut down subways, buses, logistics like the postal service or trash collection. Let the country come to a grinding halt and force a change. Cause good trouble. It works.